Here is something really interesting and benificial to all.
You can now make calls from your pc to mobiles in almost any country for free.
Here is the site that I found dat allows to call without registering but max 3 calls a day for unregistered users.
The only negative thing is that the call duration depends upon the country,for ex:if we want to call a person in united states then the free call duration is upto 4 minutes and if you want to call any person in india,then the free call duration is about 1 minute depending upon the place.
for available destinations list
Another site that gives you 10 mins of call any number in the world (tried and tested)
Above websites are working for India.
People in other countries try the following sites. I havent tried them coz they doesnt support country INDIA.
http://www.rebtel.com -10 mins of free call
If any one tries above mentioned sites and finds it genuine plz let me and others know by ur comments.